INSMED Inc 4

Chief Medical Officer Martina Flammer, M.D. sold a total of 4,424 shares of Insmed Inc. common stock for approximately $451,000 in two tax-withholding sales under a 10b5-1 plan.

On this Form 4, Insmed Inc.'s Chief Medical Officer, Martina Flammer, M.D., reported two open-market sales of common stock executed under a pre-arranged Rule 10b5-1 trading plan and explicitly described as sales to cover tax withholding obligations and related broker fees upon the vesting of Restricted Stock Units. On 2026-06-03, she sold 2,566 shares at an average price of approximately $102.27 per share, and on 2026-06-05, she sold an additional 1,858 shares at roughly $103.78 per share, for an aggregate sale value of about $451,000. Following these transactions, Dr. Flammer retained beneficial ownership of 60,486 shares of Insmed common stock, reflecting continued substantial equity exposure despite the routine, tax-driven dispositions.

Filing Facts

CIK

1104506

Ticker

INSM

Form

4

Source Type

fda

Accession

0001796960-26-000016

Alert Tier

5